Make Mandoline shut down cleanly.

mojo/application/app_lifetime_helper.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_APPLICATION_APP_LIFETIME_HELPER_H_
+#define MOJO_APPLICATION_APP_LIFETIME_HELPER_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace mojo {
+
+class AppLifetimeHelper;
+
+class ServiceRefcount {
+ public:
+  ServiceRefcount(AppLifetimeHelper* app_lifetime_helper);

[Ben Goodger (Google), 2015/05/13 20:21:07]

explicit

[jam, 2015/05/14 14:42:47]

Done.

+  ~ServiceRefcount();
+
+ private:
+  AppLifetimeHelper* app_lifetime_helper_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceRefcount);
+};
+
+// This is a helper class for apps to manage their lifetime.
+// An app can contain an object of this class as a member variable. Each time it
+// creates an instance of a service, it gives it a refcount using
+// CreateServiceRefCount. The service implementation then keeps that object as a
+// member variable. When all the service implemenations go away, the app will be
+// quit with a call to mojo::ApplicationImpl::Terminate().
+class AppLifetimeHelper {
+ public:
+  AppLifetimeHelper();
+  ~AppLifetimeHelper();
+
+  scoped_ptr<ServiceRefcount> CreateServiceRefCount();
+
+ private:
+  friend ServiceRefcount;
+  void Release();
+
+  int ref_count_;
+  DISALLOW_COPY_AND_ASSIGN(AppLifetimeHelper);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_APPLICATION_APP_LIFETIME_HELPER_H_